Bluetooth: Export ECDH selftest result in debugfs

When ECDH selftest is enabled, then besides printing the result into the
kernel message buffer, also create a debugfs file that allows retrieving
the same information.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>

diff --git a/net/bluetooth/selftest.c b/net/bluetooth/selftest.c
index 378f4064952cfd0fe954511e76d307a486118ca4..dc688f13e49612cd74decf8853b8c270803942f3 100644 (file)
--- a/net/bluetooth/selftest.c
+++ b/net/bluetooth/selftest.c
@@ -21,6 +21,8 @@
    SOFTWARE IS DISCLAIMED.
 */
 
+#include <linux/debugfs.h>
+
 #include <net/bluetooth/bluetooth.h>
 #include <net/bluetooth/hci_core.h>
 
@@ -154,6 +156,21 @@ static int __init test_ecdh_sample(const u8 priv_a[32], const u8 priv_b[32],
        return 0;
 }
 
+static char test_ecdh_buffer[32];
+
+static ssize_t test_ecdh_read(struct file *file, char __user *user_buf,
+                             size_t count, loff_t *ppos)
+{
+       return simple_read_from_buffer(user_buf, count, ppos, test_ecdh_buffer,
+                                      strlen(test_ecdh_buffer));
+}
+
+static const struct file_operations test_ecdh_fops = {
+       .open           = simple_open,
+       .read           = test_ecdh_read,
+       .llseek         = default_llseek,
+};
+
 static int __init test_ecdh(void)
 {
        ktime_t calltime, delta, rettime;
@@ -165,19 +182,19 @@ static int __init test_ecdh(void)
        err = test_ecdh_sample(priv_a_1, priv_b_1, pub_a_1, pub_b_1, dhkey_1);
        if (err) {
                BT_ERR("ECDH sample 1 failed");
-               return err;
+               goto done;
        }
 
        err = test_ecdh_sample(priv_a_2, priv_b_2, pub_a_2, pub_b_2, dhkey_2);
        if (err) {
                BT_ERR("ECDH sample 2 failed");
-               return err;
+               goto done;
        }
 
        err = test_ecdh_sample(priv_a_3, priv_a_3, pub_a_3, pub_a_3, dhkey_3);
        if (err) {
                BT_ERR("ECDH sample 3 failed");
-               return err;
+               goto done;
        }
 
        rettime = ktime_get();
@@ -186,7 +203,17 @@ static int __init test_ecdh(void)
 
        BT_INFO("ECDH test passed in %llu usecs", duration);
 
-       return 0;
+done:
+       if (!err)
+               snprintf(test_ecdh_buffer, sizeof(test_ecdh_buffer),
+                        "PASS (%llu usecs)\n", duration);
+       else
+               snprintf(test_ecdh_buffer, sizeof(test_ecdh_buffer), "FAIL\n");
+
+       debugfs_create_file("selftest_ecdh", 0444, bt_debugfs, NULL,
+                           &test_ecdh_fops);
+
+       return err;
 }
 
 #else